664860512166 has 8 divisors (see below), whose sum is σ = 1329721024344. Its totient is φ = 221620170720.

The previous prime is 664860512159. The next prime is 664860512167. The reversal of 664860512166 is 661215068466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

664860512166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664860512167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55405042675 + ... + 55405042686.

It is an arithmetic number, because the mean of its divisors is an integer number (166215128043).

Almost surely, 2^664860512166 is an apocalyptic number.

664860512166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664860512166 is a wasteful number, since it uses less digits than its factorization.

664860512166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110810085366.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 664860512166 in words is "six hundred sixty-four billion, eight hundred sixty million, five hundred twelve thousand, one hundred sixty-six".